This Image of the Week is brought to you by Drs. Eric Hamm and Claire Abramoff. Their patient was an elderly male who presented with vomiting and colicky abdominal pain. The ultrasound image below was obtained at the bedside. Can you make the diagnosis?  What does this donut shaped structure represent? 

Click here to view the answer and some teaching on the case. 

Usama Khalid, MD
Ultrasound Fellow
Department of Emergency Medicine
Emory University School of Medicine